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ISO 2833:1973

$13.00

Fluorure de sodium à usage industriel — Dosage du fluor — Méthode Willard-Winter modifiée

Published By Publication Date Number of Pages
ISO 1973-12 8
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The principle consists in separation of the fluorine from a test portion by distillation with sulphuric acid or perchloric acid. Titration with thorium nitrate solution using sodium alizarinsuphonate and methylene blue as indicators. Alternatively the thorium nitrate titration may be carried out using sodium alizarinsuphonate alone as indicator, the end-point being determined spectrophotometrically under carefully defined conditions. The absorbance at a wavelength of 525 nm shall reach the arbitrary value of 0.6. Has also been approved by the IUPAC.

ISO 2833:1973
$13.00